Abstract
Calcareous concretions that have at their core woody fragments and masses of closely arranged Teredo tubes are common in Eocene lagoonal shales of the Ameki Formation, southeastern Nigeria, Association of the concentions with the woody material suggests that, during the decomposition process of the material, a microenvironment was created with a raised pH. The process is also responsible for the precipitation of Ca ++ ion, probably as adipocere. Conversion of adipocere to CaCO 3 brought about the splitting of the core into many pieces. The pieces are covered with a thin warty layer of calcite which derived from the pore waters in the cracks.
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